Let’s focus on the third item. I don’t like special preferences in the tax code because it’s bad for growth when the tax code lures people into misallocating their labor and capital. Ethanol, for instance, shows how irrational decisions are subsidized by the IRS.

Moreover, I’d rather have smart and capable people in the private sector focusing how to create wealth instead of spending their time figuring out how to manipulate the internal revenue code.

That’s why, in my semi-dream world, I’d like to see a flat tax.* Not only would there be a low rate and no double taxation, but there also would be no distortions.

And I’m also happy that lower tax rates are an indirect way of reducing the value of loopholes and other preferences.

To understand the indirect benefits of low tax rates, consider this new report from the Washington Post. Unsurprisingly, we’re discovering that a less onerous death tax means less demand for clever tax lawyers.

A single aging rich person would often hire more than a dozen people — accountants, estate administrators, insurance agents, bank attorneys, financial planners, stockbrokers — to make sure they paid as little as possible in taxes when they died. But David W. Klasing, an estate tax attorney in Orange County, Calif., said he’s seen a sharp drop in these kinds of cases. The steady erosion of the federal estate tax, shrunk again by the Republican tax law last fall, has dramatically reduced the number of Americans who have to worry about the estate tax — as well as work for those who get paid to worry about it for them, Klasing said. In 2002, about 100,000 Americans filed estate tax returns to the Internal Revenue Service, according to the IRS. In 2018, only 5,000 taxpayers are expected to file these returns… “You had almost every single tax professional trying to grab as much of that pot as they could,” Klasing said. “Now almost everybody has had to find other work.”

Needless to say, I’m delighted that these people are having to “find other work.”

By the way, I’m not against these people. They were working to protect families from an odious form of double taxation, which was a noble endeavor.

I’m simply stating that I’m glad there’s less need for their services.

Charles “Skip” Fox, president of the American College of Trust and Estate Counsel, said he frequently hears of lawyers shifting their focus away from navigating the estate tax, and adds that there has been a downturn in the number of young attorneys going into the estate tax field. Jennifer Bird-Pollan, who teaches the estate tax to law students at the University of Kentucky, said that nearly a decade ago her classes were packed with dozens of students. Now, only a handful of students every so often may be interested in the subject or pursuing it as a career. “There’s about as much interest in [the class] law and literature,” Pollan said. “The very, very wealthy are still hiring estate tax lawyers, but basically people are no longer paying $1,000 an hour for advice about this stuff. They don’t need it.”

Though I am glad one lawyer is losing business.

Stacey Schlitz, a tax attorney in Nashville, said when she got out of law school about a decade ago roughly 80 percent of her clients were seeking help with their estate taxes. Now, less than 1 percent are, she said, adding that Tennessee’s state inheritance tax was eliminated by 2016. “It is disappointing that this area of my business dried up so that such a small segment of society could get even richer,” Schlitz said in an email.

I hope every rich person in Nashville sees this story and steers clear of Ms. Schlitz, who apparently wants her clients to be victimized by government.

Now let’s shift to the business side of the tax code and consider another example showing why lower tax rates produce more sensible behavior.

US investment in Ireland declined by €45bn ($51bn) in 2017, in another sign that sweeping tax reforms introduced by US president Donald Trump have impacted the decisions of American multinational companies. …Economists have been warning that…Trump’s overhaul of the US tax code, which aimed to reduce the use of foreign low-tax jurisdictions by US companies, would dent inward investment in Ireland. …In November 2017, Trump went so far as to single out Ireland, saying it was one of several countries that corporations used to offshore profits. “For too long our tax code has incentivised companies to leave our country in search of lower tax rates. It happens—many, many companies. They’re going to Ireland. They’re going all over,” he said.

Incidentally, I’m a qualified fan of Ireland’s low corporate rate. Indeed, I hope Irish lawmakers lower the rate in response to the change in American law.

Today’s lesson is simply that lower tax rates reduce incentives to engage in tax planning. I’ll close with simple thought experiment showing the difference between a punitive tax system and reasonable tax system.

60 percent tax rate – If you do nothing, you only get to keep 40 cents of every additional dollar you earn. But if you find some sort of deduction, exemption, or exclusion, you increase your take-home pay by an additional 60 cents. That’s a good deal even if the tax preference loses 30 cents of economic value.

20 percent tax rate – If you do nothing, you get to keep 80 cents of every dollar you earn. With that reasonable rate, you may not even care about seeking out deductions, exemptions, and exclusions. And if you do look for a tax preference, you certainly won’t pick one where you lose anything close to 20 cents of economic value.

The bottom line is that lower tax rates are a “two-fer.” They directly help economic growth by increasing incentives to earn income and they indirectly help economic growth by reducing incentives to engage in inefficient tax planning.